diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3299,11 +3299,15 @@
       if (Left.isOneOf(tok::kw_try, Keywords.kw___except, tok::kw_catch))
         return Style.SpaceBeforeParensOptions.AfterControlStatements ||
                spaceRequiredBeforeParens(Right);
-      if (Left.isOneOf(tok::kw_new, tok::kw_delete) ||
-          (Left.is(tok::r_square) && Left.MatchingParen &&
-           Left.MatchingParen->Previous &&
-           Left.MatchingParen->Previous->is(tok::kw_delete)))
-        return Style.SpaceBeforeParens != FormatStyle::SBPO_Never ||
+      if (Left.isOneOf(tok::kw_new, tok::kw_delete))
+        return ((!Line.MightBeFunctionDecl || !Left.Previous) &&
+                Style.SpaceBeforeParens != FormatStyle::SBPO_Never) ||
+               spaceRequiredBeforeParens(Right);
+
+      if (Left.is(tok::r_square) && Left.MatchingParen &&
+          Left.MatchingParen->Previous &&
+          Left.MatchingParen->Previous->is(tok::kw_delete))
+        return (Style.SpaceBeforeParens != FormatStyle::SBPO_Never) ||
                spaceRequiredBeforeParens(Right);
     }
     if (Line.Type != LT_PreprocessorDirective &&
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -9919,6 +9919,11 @@
   verifyFormat("void operator new(void *foo) ATTRIB;");
   verifyFormat("void operator delete[](void *foo) ATTRIB;");
   verifyFormat("void operator delete(void *ptr) noexcept;");
+
+  EXPECT_EQ("void new(link p);\n"
+            "void delete(link p);\n",
+            format("void new (link p);\n"
+                   "void delete(link p);\n"));
 }
 
 TEST_F(FormatTest, UnderstandsUsesOfStarAndAmp) {